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Joost was an Internet TV service, created by Swede Niklas Zennström and Janus Friis (founders of Skype and Kazaa). During 2007-2008 Joost used peer-to-peer TV (P2PTV) technology to distribute content to their Mozilla-based desktop player; in late 2008 this was migrated to use a Flash-based Web player instead. Joost began development in 2006. Working under the code name "The Venice Project", Zennström and Friis assembled teams of some 150 software developers in about six cities around the world, including New York, London, Leiden and Toulouse. According to Zennström at a 25 July 2007 press conference about Skype held in Tallinn, Estonia, Joost had signed up more than a million beta testers, and its launch was scheduled for the end of 2007. The team signed up with Warner Music, Indianapolis Motor Speedway Productions (Indianapolis 500, IndyCar Series) and production company Endemol for the beta.〔Orlowski, Andrew (January 17, 2007). (Joost - the new, new TV thing. ) ''The Register''〕 In February 2007, Viacom entered into a deal with the company to distribute content from its media properties, including MTV Networks, Black Entertainment Television (BET) and film studio Paramount Pictures. The company went through restructuring several times and sold most of its assets in 2009; it suspended operations in 2012. == Technology == The program was based on P2PTV technology and was expected to deliver (relaying) near-TV resolution images. It turned a PC into an instant on-demand TV with no need for an additional set-up box. News updates, discussion forums, show ratings, and multi-user chat sessions (often linked to the active stream/channel) were made possible through the use of semi-transparent widget overlays. The initial version of the software was based on XULRunner and the audio management re-used the ZAP Media Kit. The peer to peer layer for on-demand video came from the Joltid company, which also provided the peer to peer layer of Skype. A peer to peer layer for live video was developed from scratch, with a first trial run broadcasting March Madness 2008. The video playback used the CoreCodec, CoreAVC H.264 video decoder. Joost soft launched its Widget API on August 29, 2007 under a non-copyleft open source license and encouraged third party developers to create tools for its TV 2.0 platform. In 2009 Joost released a special website for the PlayStation 3 Internet browser that took advantage of some of the browser's full screen and 'x' button capabilities. By holding the 'x' button you could choose various video options using the d-pad. As opposed to streaming technology in which all clients get the feed from the server, P2P TV technology differs in the sense that the servers serve only a handful of clients; each of the clients in turn propagate the stream to more downstream clients and so on. This moves the distribution costs from the channel owner to the user. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Joost」の詳細全文を読む スポンサード リンク
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